基于 Morris的SWMM模型参数敏感性分析

随着城市化的不断推进,城市洪水、内涝问题日益严重。国内外广泛使用的SWMM模型在防洪排涝的实践中发挥着重要作用,模型参数的确定是其应用可靠的关键性问题。本文利用Morris筛选法,以龙岩市中心城区为例,研究SWMM模型的不同水文水力参数对区域洪峰流量和径流系数的影响程度。研究结果表明,对径流系数影响最大的参数是不渗透性、最小渗入速率和漫流宽度,对洪峰流量影响最大的参数是不渗透性、漫流宽度和渗透性粗糙系数。文中结果有利于提高模型参数选取的效率,也能提高模拟结果的准确度,为今后SWMM模型的应用研究提供参考。

Sensitivity analysis of SWMM model parameters based on Morris method

With the continuous progress of urbanization, the problems of flood and waterlogging in urban become worsening. The SWMM model widely used at home and abroad plays an important role in flood control and drainage.The determination of model parameter is the key issue of reliable application.The paper used Morris screening method and took the central urban area of Longyan city as example to analyze the effect degree of different hydrological and hydraulic parameters in SWMM model on regional peak flow and runoff coefficient. The results show that the parameters of the greatest impact on runoff coefficient are impervious surface coverage, minimum penetration rate and overflow width, and that on flow of flood peak is impervious surface coverage, ragged coefficient of permeability and overflow width. The result can help improve the selection efficiency of model parameters, upgrade the accuracy of simulation result and provide reference for the application research of SWMM model.